/Engine/Source/Runtime/Datasmith/DatasmithCore/Public/IDatasmithSceneElements.h
Get the material mapping for slotIndex
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< const [IDatasmithMaterialIDElement](API\Runtime\DatasmithCore\IDatasmithMaterialIDElement) > GetMaterialSlotAt ( int32 Index ) const